CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Net sales	$ 287,780	$ 268,001	$ 577,931	$ 548,177
Cost of products sold	144,088	133,843	288,174	273,661
Gross margin	143,692	134,158	289,757	274,516
Operating expenses:
Research and development	11,314	9,481	21,834	18,627
Selling, general and administrative	97,582	94,715	197,716	192,719
Total operating expenses	108,896	104,196	219,550	211,346
Operating income	34,796	29,962	70,207	63,170
Other income (expense):
Investment and other income	1,056	596	1,272	107
Interest expense	(829)	(1,458)	(1,692)	(3,190)
Earnings before income taxes	35,023	29,100	69,787	60,087
Income tax expense	30,750	3,803	39,678	12,237
Net earnings	$ 4,273	$ 25,297	$ 30,109	$ 47,850
Weighted average common shares outstanding (in thousands):
Weighted average common shares outstanding, basic (in thousands):	51,698	51,054	51,569	50,844
Weighted average common shares outstanding, diluted (in thousands):	52,719	51,954	52,551	51,721
Class A nonvoting common stock
Earnings Per Share
Net earnings per share, basic	$ 0.08	$ 0.50	$ 0.58	$ 0.94
Net earnings per share, diluted	0.08	0.49	0.57	0.93
Dividends	$ 0.21	$ 0.21	$ 0.42	$ 0.41
Class B voting common stock
Other income (expense):
Earnings from continuing operations	$ (4,273)	$ 25,297	$ 29,294	$ 47,048
Earnings Per Share
Net earnings per share, basic	$ 0.08	$ 0.50	$ 0.57	$ 0.93
Net earnings per share, diluted	0.08	0.49	0.56	0.91
Dividends	$ 0.21	$ 0.21	$ 0.40	$ 0.39